Fix isStaff to exclude default ACLs

Author: carlbennett

src/libraries/User.php

@@ -543,7 +543,6 @@ public function isStaff() {
       self::OPTION_ACL_DOCUMENT_CREATE  |
       self::OPTION_ACL_DOCUMENT_MODIFY  |
       self::OPTION_ACL_DOCUMENT_DELETE  |
-      self::OPTION_ACL_COMMENT_CREATE   |
       self::OPTION_ACL_COMMENT_MODIFY   |
       self::OPTION_ACL_COMMENT_DELETE   |
       self::OPTION_ACL_EVENT_LOG_VIEW   |